This item is titled the "Toddler Mini Backpack". However, it is probably just a smaller than usual school bag that anyone could use. It is only 12 inches high (where usual packs are 16 to 18) so you could only store smaller items in it. It's all blue with black nylon for the straps. The exterior is flat (no pockets) with a nice neo classic jumping Sonic on a light blue checkered background.

Did this item ever get made? The art for it appeared in mid-2015, but has this actual small size pack appeared for sale in any stores? This item lands on the prototypes page because it is only art of something somone intended to produce.